error start/stop

[mrGreenS]

It is required to turn on and turn off Deribit connection. In the code below it is evident that in case of pressing start stop and start again the connection will not reestablish.

import sys
import asyncio
from asyncqt import QEventLoop, asyncSlot, asyncClose
from ssc2ce import Deribit
from PyQt5.QtWidgets import (QApplication, QWidget, QLabel, QTextEdit, QPushButton,QVBoxLayout)

class MainWindow(QWidget):
    def __init__(self):
        super().__init__()

        self.setLayout(QVBoxLayout())

        self.lblStatus = QLabel('Idle', self)
        self.layout().addWidget(self.lblStatus)

        self.editResponse = QTextEdit('', self)
        self.layout().addWidget(self.editResponse)

        self.btnStart = QPushButton('Start', self)
        self.btnStart.clicked.connect(self.on_btnStart_clicked)
        self.layout().addWidget(self.btnStart)

        self.btnStop = QPushButton('Stop', self)
        self.btnStop.clicked.connect(self.on_btnStop_clicked)
        self.layout().addWidget(self.btnStop)

        self.conn = Deribit()
        self.loop = asyncio.get_event_loop()
        self.feed_task = None
        self.conn.on_connect_ws = self.subscribe
        self.conn.method_routes += [("subscription", self.handle_subscription)]

    @asyncClose
    async def closeEvent(self, event):
        await self.session.close()

    @asyncSlot()
    async def on_btnStart_clicked(self):
        self.btnStart.setEnabled(False)
        self.lblStatus.setText('Start...')

        try:
            self.feed_task = asyncio.ensure_future(self.conn.run_receiver())
        except Exception as exc:
            self.lblStatus.setText(self.lblStatus.text() + '\nError: {}'.format(exc))
        finally:
            self.btnStart.setEnabled(True)

    @asyncSlot()
    async def on_btnStop_clicked(self):
        self.btnStop.setEnabled(False)
        self.lblStatus.setText('Stop...')

        try:
            self.feed_task = asyncio.ensure_future(self.conn.stop())
        except Exception as exc:
            self.lblStatus.setText(self.lblStatus.text() + '\nError: {}'.format(exc))
        finally:
            self.btnStart.setEnabled(True)

    async def subscribe(self):
        await self.conn.send_public(request={
            "method": "public/subscribe",
            "params": {
                "channels": ["deribit_price_index.btc_usd"]
            }
        })

    async def handle_subscription(self, data):
        method = data.get("method")
        if method and method == "subscription":
            if data["params"]["channel"].startswith("deribit_price_index"):
                index_name = data["params"]["data"]["index_name"]
                price = data["params"]["data"]["price"]
                self.editResponse.append(f"Deribit Price Index {index_name.upper()}: {price}")

if __name__ == "__main__":
    app = QApplication(sys.argv)
    loop = QEventLoop(app)
    asyncio.set_event_loop(loop)

    mainWindow = MainWindow()
    mainWindow.show()

    with loop:
        sys.exit(loop.run_forever())

[olned]

Fixed, look at 0.14.2
And I made a liitle changes in your example

import sys
import asyncio
from asyncqt import QEventLoop, asyncSlot, asyncClose
from ssc2ce import Deribit
from PyQt5.QtWidgets import (QApplication, QWidget, QLabel, QTextEdit, QPushButton, QVBoxLayout)


class MainWindow(QWidget):
    def __init__(self):
        super().__init__()

        self.setLayout(QVBoxLayout())

        self.lblStatus = QLabel('Idle', self)
        self.layout().addWidget(self.lblStatus)

        self.editResponse = QTextEdit('', self)
        self.layout().addWidget(self.editResponse)

        self.btnStart = QPushButton('Start', self)
        self.btnStart.clicked.connect(self.on_btnStart_clicked)
        self.layout().addWidget(self.btnStart)

        self.btnStop = QPushButton('Stop', self)
        self.btnStop.clicked.connect(self.on_btnStop_clicked)
        self.btnStop.setEnabled(False)
        self.layout().addWidget(self.btnStop)

        self.conn = Deribit()
        self.loop = asyncio.get_event_loop()
        self.feed_task = None
        self.conn.on_connect_ws = self.subscribe
        self.conn.method_routes += [("subscription", self.handle_subscription)]

    @asyncClose
    async def closeEvent(self, event):
        if self.conn and self.conn.is_connected():
            await self.conn.stop()

    @asyncSlot()
    async def on_btnStart_clicked(self):
        self.btnStart.setEnabled(False)
        self.lblStatus.setText('Start...')

        try:
            if not self.feed_task:
                self.btnStop.setEnabled(True)
                await self.conn.run_receiver()
                self.btnStop.setEnabled(False)
        except Exception as exc:
            self.lblStatus.setText(self.lblStatus.text() + '\nError: {}'.format(exc))
        finally:
            self.btnStart.setEnabled(True)

    @asyncSlot()
    async def on_btnStop_clicked(self):
        self.btnStop.setEnabled(False)
        self.lblStatus.setText('Stop...')

        try:
            await self.conn.stop()
            self.feed_task = None
        except Exception as exc:
            self.lblStatus.setText(self.lblStatus.text() + '\nError: {}'.format(exc))

    async def subscribe(self):
        await self.conn.send_public(request={
            "method": "public/subscribe",
            "params": {
                "channels": ["deribit_price_index.btc_usd"]
            }
        })

    async def handle_subscription(self, data):
        method = data.get("method")
        if method and method == "subscription":
            if data["params"]["channel"].startswith("deribit_price_index"):
                index_name = data["params"]["data"]["index_name"]
                price = data["params"]["data"]["price"]
                self.editResponse.append(f"Deribit Price Index {index_name.upper()}: {price}")


if __name__ == "__main__":
    app = QApplication(sys.argv)
    loop = QEventLoop(app)
    asyncio.set_event_loop(loop)

    mainWindow = MainWindow()
    mainWindow.show()

    with loop:
        sys.exit(loop.run_forever())